Furnace.



ww www No. s48,25|. PatentdApr. 24, |900.

J. GARDEN. FUBNACE'.

(Application Bled Oct. 20, 1894.) (No Model.)

Y h Y UNITED STATES PATENT GEEICE..

.IAMEs GARDEN, OE PORTLAND, OREGON, AssIeNOR To M. s. PHILLIPS, OE

TINOUP, COLORADO. D

FU RNACE.

SPECIFICATION forming part of Letters Patent No. 648,251, dated April 24, 1900. Application fled October 20,1894. Serial No. 5 26,520. (No model.)

-To a/ZZ whom it mag/concern:

Beit known that I, JAMES GARDEN, of the city of Portland, in the county of Multnomah and State of Oregon, haveinvented certain new and useful Improvements'in Furnaces, (for which I have obtained a patent of Great Britain, No. 4,367, dated February 28, 1895,) of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specication, in which corresponding letters of refr erence in the different figures indicate like parts. V

The primary object of my invention is to so construct a furnace, in combination with an underfeed mechanical stoker, that the air may be supplied to the furnace at the point of combustion, while at the same time the gases formed may be prevented from returning or escaping otherwise than through the iue or stack designed therefor. v

To these ends my invention consists in the combination of elements hereinafter more particularly described and definitely claimed. In the drawings, Figure l is a longitudinal vertical'seotional view of a furnace embodying the features of myinvention.` Fig. 2 is a transverse vertical sectional view of said furnace, taken upon the line 2 2, Fig. l. Fig. 3 is an enlarged plan view in detail of a deadplate employed in said furnace. Fig. 4 isa side View of -the same,- and Fig. 5 is a transverse sectional view thereof.

Referring to the drawings, c, Figs. l and 2, represents what is commonly known as a water-leg boiler, to which is applied my improved furnace, having the usual re-box b. In front of the furnace and beneath the Jrire-level is placed a feeding-ram c, Fig. l, which consists of the usual plunger or pusher d, inolosed within a suitable cylinder and connected by means of a rod, as shown, with a steam-piston or other suitable means for reciprocating the same. A hopper e is placed above and in communication with the cylinder or fuel-conduit f. That portion f of the fuel-conduit which is within the furnace is preferably of a concave or trough shape in cross-section and is extended back through the middle of the fire-box to a point at or near the rear of the latter.` The fuel-conduit, for

which I make no claim, may be made of castiron, fire-brick or other suitable material.

Upon each side of the fuel-conduit is an air-chamber I?, (better shown in Fig. 2,) the 55 two uniting at the front in a common passage-way j', which is connected in turn with a suitable fan or air-compressor. Openings are formed in the top of the casing, into which are fitted a series of removable twyers 7c, leav- 6o ing an outlet-opening i', the construction of which and the manner of securing the same in place are well known. By means'of this device air may be forced into and thoroughly mixed with the fresh fuel at the point of com5 65 bustion.

As the air is forced into thefurnace through the means described a back or downward pressure is produced which is sufficient to force the air and .gas downwardly through the ordinary grate heretofore employed and thence into the furnace-room. This objectionable feature often becomes so serious as Jto destroy the gratelbars in a few moments,

besides causing the escape of the Vnoxious gases in such a Way as to cause inconven ience if not positive injury to the attendants. In order to obviate this objection, I have in my improved construction dispensed with the usual grate, and in lieu thereof I have sealed 8o or closed the space occupied thereby preferably by placing upon eac'h side of the twyers a dead-plate Z,of cast-iron, which is supported upon suitable ii'anges or lugs in such manner as to enable it to be readily removed. Each By means of suit- 9o bottom of the furnace may be built up solidly with iire-brick,except the airpassages leading to the twyers, thus leaving no opening corresponding to the usual ash-pit beneath; but I prefer the construction shown, as it may the more readily be repaired.

As a result of theconstruction described, it will be observed that the fiat ledge or shelf is formed upon each side of the conduit corresponding to the-ordinary grate-surface over which the fuel spreads as it is fed into the conduit, and as sufficient air is admitted through the twyers to support combustion the fuel is not only entirely consumed, but as no air is admittedfin the usual Way through the l front of the furnace the fire may be more per'- therewith. l e f Having `thus described my invention, I

' j 1; lA sealed or grateiess underfeed-furnacfe fectly controlled. n

I have found in practice that by closingzthe furnace to the admission ofair except through the twyers the most satisfactory results may be obtained. v Y

My improved device is especially applicable to marine work, and may be used to excellent' advantage by se'alingthe front of the furnace and r employing an' Overblast in connection y vin-.vvhich is combineda fuel-conduit adapted to feed the lfuel from beneath, means-for introducing-the `fuel thereto,` air-openings v 25 Within or inoperative proximity tor said. con@ .i duit, ni'eans .for forcing air Vinto the furnacel through said: openings, laterally-proj ecting I sealedor air-'tight ledges overwhich the fuel may spread and Abe'consumedwhen forced upvvardly through the cond uit, and means for 3ov v preventing the admission of air except through said air-openings within or adjacent tothe conduit', `whereby air may bentroduced under pressure, a backfiow ofl gases preventedand combustion insured, substantially as described.,

2. The combination Witha furnace of the class described, 'of' an underfeed-v conduit,

means for introducing fuel thereto, means for introducing a blast of air to openings adjacent tothe conduit and dead-plates forming lateryally-projecting'air-tightledges for the reception and support of the fuel, substantially as set forth. I Y

3. The combination with a furnace, of an vunderfeed conduit, -meansrfor introducing fuel thereto, vmeans Vfor in troduc'ing "a blast of air to openings adjacent to the'V conduit, the

t bottom of said furnace beingxentirely closed 

